The doctors are ________ about the guidelines under which they can carry out euthanasia.
A. at a stretch B. at a loss C. at random D. at length
本题考查的是短语区分。A.不休息地，连续地;B.不知所措，茫然，不了解;C.任意的，随便的;D.最后，终于。句意：医生们不了解执行安乐死的准则。
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